Soc 20-Levers

Question 1

What is a lever?

Answer 1

In the body, Term lever refers to a system of muscles and bones working together to bring about movement
When you excerise, your muscles pull on your bones, and your bones create movement acting as levers

Question 2

What are the four componants of a lever?

Answer 2

Fulcrum-(pivot)- point sround which the lever rotates
Load- force that is applied by the lever system(resistance)
Effort- force that is applied by the user of the lever system (muscles)
Lever arm- a rigid bar such as a bone

Question 3

What images represent each part?

Answer 3

Fulcrum- triangle
Load- a box/parcel
Effort- arrow
Lever arm- long lever

Question 4

What are the three different types of levers and what are they?

Answer 4

First class lever- fulcrum is in the middle
Second class lever-load is in the middle
Third class lever- effort is in the middle

Question 5

What are 2 examples of a first class lever?

Answer 5

Tricep dips and nodding your head

Question 6

What are 2 examples of a second class lever?

Answer 6

Calf rasier and lifting a wheelbarrow

Question 7

What are 2 examples of third class levers?

Answer 7

Bicep curls and using a spade

Question 8

What is the definition of mechanical advantages and what are they?

Answer 8

A large load can be lifted with a relatively small amount of effort
- This happens when the output of the lever is greater than the input
- First and second class levers both work with mechanical advantages

Question 9

What is the definition and what are mechanical disadvantages?

Answer 9

Third class levers cannot lift as heavy a load with the same amount of effort, due to the position of the effort and load from the fulcrum.
-Happens when effort and load are both the same side of fulcrum but effort sits closer to fulcrum than load
-Input of lever is greater than output- force you apply is greater than the load
-Third class levers work at mechanical disadvatage